Effect of SiC on hydrogen storage properties of Mg95Ni5 prepared by hydriding combustion synthesis and mechanical milling
Effect of SiC on hydrogen storage properties of Mg95Ni5 prepared by hydriding combustion synthesis and mechanical milling
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SiC对氢化燃烧合成机械球磨制备Mg95Ni5储氢性能的影响
DOI：
10.1016/j.jallcom.2012.06.064
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发表时间：
2012-10
影响因子：
6.2
通讯作者：
Li Liquan
中科院分区：
文献类型：
--
作者：
Wei Lingjun;Zhu Yunfeng;Li Liquan
研究了SiC对高温燃烧合成-机械球磨（HCS + MM）法制备的Mg 95 Ni 5合金储氢性能的影响。含2 wt.%的产品在HCS + MM产品中，SiC掺杂对储氢性能的改善效果最好。其饱和氢容量仅需80 s即可达到5.91 wt.%在523 K下，在1800 s内解吸出69.7%的氢。Mg 95 Ni 5 + 2 wt.%的Mg 95 Ni 5合金的放氢活化能从160 kJ/mol降低到143 kJ/mol表明SiC对复合材料的放氢性能有明显的促进作用。更重要的是，循环时效分析表明，HCS + MM-Mg 95 Ni 5 + 2 wt.% SiC复合材料在473 K具有良好的循环稳定性。结果表明，添加SiC的HCS + MM制品的微观结构对提高其吸放氢性能和循环性能有显著影响。
The effect of SiC on the hydrogen storage properties of Mg95Ni5prepared by hydriding combustion synthesis and mechanical milling (HCS + MM) was studied. Product with 2 wt.% SiC doping is the best one among these HCS + MM products in improving the hydrogen storage properties. It required only 80 s to reach its saturated hydrogen capacity of 5.91 wt.% at 373 K and desorbed 69.7% hydrogen within 1800 s at 523 K. The activation energy for hydrogen desorption decreased from 160 kJ/mol for Mg95Ni5to 143 kJ/mol for Mg95Ni5+ 2 wt.% SiC, indicating that SiC has an obvious positive effect on the dehydriding properties. More importantly, cyclic hydriding analysis demonstrated that the HCS + MM–Mg95Ni5+ 2 wt.% SiC composite possessed excellent cyclic hydriding stability at 473 K. It is suggested that the microstructures of the HCS + MM products with SiC addition had remarkable influence on the enhancing of the hydriding/dehydriding and cyclic properties.
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